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Fixed lscbx

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dingusdev 2022-11-15 07:40:37 -07:00
parent 13684f7c0b
commit 8f99510af0
1 changed files with 22 additions and 19 deletions
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41
cpu/ppc/poweropcodes.cpp
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@ -137,7 +137,7 @@ void dppc_interpreter::power_dozi() {
void dppc_interpreter::power_lscbx() {
ppc_grab_regsdab();
ppc_effective_address = (reg_a == 0) ? ppc_result_b : ppc_result_a + ppc_result_b;
ppc_result_d = 0xFFFFFFFF;
//ppc_result_d = 0xFFFFFFFF;
uint8_t return_value = 0;
uint32_t bytes_to_load = (ppc_state.spr[SPR::XER] & 0x7f);
@ -148,25 +148,28 @@ void dppc_interpreter::power_lscbx() {
uint32_t bitmask = 0xFF000000;
uint8_t shift_amount = 24;
while (return_value != matching_byte) {
if (bytes_to_load > 0) {
return_value = mmu_read_vmem<uint8_t>(ppc_effective_address);
// return_value = mem_grab_byte(ppc_effective_address);
ppc_result_d = (ppc_result_d & ~(bitmask)) | (return_value << shift_amount);
ppc_store_result_regd();
if (bitmask == 0x000000FF) {
reg_d = (reg_d + 1) & 31;
ppc_result_d = 0xFFFFFFFF;
bitmask = 0xFF000000;
shift_amount = 24;
} else {
bitmask >>= 8;
shift_amount -= 8;
}
ppc_effective_address++;
bytes_copied++;
bytes_to_load--;
while (bytes_to_load > 0) {
return_value = mmu_read_vmem<uint8_t>(ppc_effective_address);
// return_value = mem_grab_byte(ppc_effective_address);
ppc_result_d = (ppc_result_d & ~(bitmask)) | (return_value << shift_amount);
ppc_store_result_regd();
if (bitmask == 0x000000FF) {
reg_d = (reg_d + 1) & 31;
//ppc_result_d = 0xFFFFFFFF;
bitmask = 0xFF000000;
shift_amount = 24;
}
else {
bitmask >>= 8;
shift_amount -= 8;
}
if (return_value == matching_byte)
break;
ppc_effective_address++;
bytes_copied++;
bytes_to_load--;
}
ppc_state.spr[SPR::XER] = (ppc_state.spr[SPR::XER] & 0xFFFFFF80) | bytes_copied;